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R. S. Lieberman, J. France, D. A. Ortland, and S. D. Eckermann

is a measure of planetary wave (PW) activity, the reported correlation implies the imprinting of strong wintertime stratospheric PW activity upon the anomalously warm summer mesopause. Quite recently, Smith et al. (2020) argued that statistically, the summer mesosphere warming is an extension of the wave-driven winter hemisphere circulation that arises from global wind balance and mass continuity requirements. However, most theoretical investigations into this so-called interhemispheric

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Ángel F. Adames and John M. Wallace

levels. In tutorials for lay audiences, the atmospheric circulation during El Niño is often depicted as a weakening of a deep overturning circulation cell in the equatorial plane, referred to by Bjerknes (1969) as the “Walker circulation.” However, in reality the tropical atmospheric signature of ENSO is fully three-dimensional, and it involves regional features, equatorial planetary waves, and the zonally symmetric circulation. The sea level pressure (SLP) signature of ENSO, known as the Southern

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Gabriel Wolf and Volkmar Wirth

to only use the synoptic- and smaller-scale part of the wind field for the semigeostrophic coordinate transformation. The rationale for this approach is that the quasi-stationary planetary waves can be considered as part of the background flow, which should not be included into the coordinate transformation. More specifically we use u g ([ s 1 , s 2 ]) and υ g ([ s 1 , s 2 ]) instead of u g and υ g in the semigeostrophic coordinate transformation in (9) and (10) , where the notation

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Allan J. Clarke and Marcelo Dottori

. , 1998 : On “too fast” baroclinic planetary waves in the general circulation. J. Phys. Oceanogr. , 28 , 1739 – 1758 . Dewar , W. K. , and M. Y. Morris , 2000 : On the propagation of baroclinic waves in the general circulation. J. Phys. Oceanogr. , 30 , 2637 – 2649 . Ebisuzaki , W. , 1997 : A method to estimate the statistical significance of a correlation when the data are serially correlated. J. Climate , 10 , 2147 – 2153 . Enfield , D. B. , and J. S. Allen , 1980 : On

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William K. Dewar

470JOURNAL OF PHYSICAL OCEANOGRAPHYVOLUME 17Planetary Shock Waves WILLIAM I~ DEWARDepartment of Oceanography and Supercomputer Conlputations Research Institute, Florida State University, Tallahassee, FL 32306(Manuscript received 27 May 1986, in final form 26 September 1986) A number of general circulation models have recently been proposed that compute the steady.slate structureof the general circulation. Observations of 18-C water formation, on the other hand, su

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Anne L. Laraia and Tapio Schneider

-tropospheric zonal wind at the equator vs , with fixed values of and γ . For all three curves, . For faster planetary rotation rates, the equatorial winds become more westerly with decreasing (cf. third and fourth rows in Fig. 1 ). This is in line with the notion that larger meridional temperature gradients produce stronger baroclinic instability in midlatitudes, leading to off-equatorial wave generation and angular momentum flux divergence near the equator. For slower rotation rates, however, the

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Kevin M. Grise and David W. J. Thompson

; Gettelman and Forster 2002 ; Fueglistaler et al. 2009 ). Zonal asymmetries in the TTL temperature field are predominantly linked to the quasi-stationary planetary wave pattern in the tropical troposphere ( Highwood and Hoskins 1998 ; Fueglistaler et al. 2009 ). These equatorial planetary waves reflect the equatorial Rossby and Kelvin wave responses to the climatological-mean distribution of latent heating from deep convection in the tropics ( Dima et al. 2005 ; Dima and Wallace 2007 ). The observed

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John Marshall and Damon W. K. So

15APmLI990 JOHN MARSHALL AND DAMON W. K. SO 963Thermal Equilibration of Planetary Waves JOHN MARSHALL AND DAMON W. K. SOSpace and Atmospheric Physics Group, Department of Physics, Imperial College, London, England(Manuscript received 28 October 1988, in final form 7 September 1989) ABSTRACT Equilibration of planetary waves toward free-mode forms, steady solutions of the unforced

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Jeffrey Shaman and Eli Tziperman

1. Introduction Studies of atmospheric planetary wave dynamics date back to their first description by Carl-Gustav Rossby (e.g., Rossby 1939 ). These waves are responsible for a substantial portion of the large-scale communication, or teleconnection, of remotely forced variability around the planet. Synoptic variability, jet stream meanderings, and large-scale climate patterns [e.g., the Pacific–North American (PNA) pattern] have all been described in the context of Rossby waves. In particular

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RICHARD D. LINDZEN

Richard D. Lindzen441PLANETARY WAVES ON BETA-PLANES RICHARD D. LINDZENNational Center for Atmospheric Research, Boulder, Colo.ABSTRACTThe problem of linearized oscillations of the gaseous envelope of a rotating sphere (with periods in excess of a.day) is considered using the @-plane approximation. Two particular @-planes are used-one centered at the equator,the other at a middle latitude. Both forced and free oscillations are considered. With both planes it is possibleto approximate

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